var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

//解决跨域问题 ajax->只能访问相同的域名，相同端口下的资源
app.all('/*',(req,res,next)=>{
  res.header('Access-Control-Allow-Headers','X-Requested-With, Authorization')
  res.header('Access-Control-Allow-Origin','*')
  res.header('Access-Control-Allow-Headers', 'X-Requested-With, mytoken')
  res.header('Access-Control-Allow-Headers', 'Content-Type,Content-Length, Authorization, Accept,X-Requested-With')
  res.header('Access-Control-Allow-Methods','GET,POST,PUT,DELETE,OPTIONS')
  res.header('X-Powered-By', ' 3.2.1')
  // 让options快速响应
  if(req.method.toLocaleUpperCase == 'OPTIONS') res.send(200)
  else next()
})

app.use('/', indexRouter);
app.use('/users', usersRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
